I am trying to get my VTA-VR to actually use T.38 to fax out. I tested with 2 VTA-VRs connected to my asterisk server (1 to a 56k USR modem, 1 to an old HP 3200 Fax/Laser printer) I have enabled t.38 passthru and have enabled the T.38 in VTA-VR, but have noticed that the invite looks a little non-standard. The VTA-VR sends out m=audio a=rtpmap:110 t38-udp/8000 instead of just .... t38/8000

Most of the t38 invites I saw post related to asterisk has the m=image 4908 udptl t38 format, this appears to be defined in (RFC 3363, 2002)

Does anyone know if audio/t38 (RFC 4612, 2006) is/will be supported, and if yes, can it be modified to allow for t38-rtp , t38-udp media types?

For the below messages, 192.168.0.6 is VTA-VR on the HPLJ 3200. 192.168.0.7 is VTA-VR connected to USR modem/Windows XP. 192.168.0.14 is Asterisk in between.